| 摘要 |
PROBLEM TO BE SOLVED: To assure an illuminance of a fluorescent lamp and to prevent wasteful heating as much as possible. SOLUTION: The illuminator comprises the fluorescent lamp 42 for illuminating in a cooled cabinet 2, a cylinder 43 for the lamp having the lamp 42 inserted and light transmittance, a reflecting case 21 having the lamp 42 and the cylinder 43 arranged therein and an opened lower surface, and a plurality of heaters 41A, 41B provided at an upper surface side of the case 21. In this case, when the lamp 42 is lit, any of the heaters 41A, 41B such as, for example, a sub-heater 41B stops energizing. |
